public static HRESULT WriteEx(HandleRef himl, ILP dwFlags, Ole32.IStream pstm)
{
HRESULT result = WriteEx(himl.Handle, dwFlags, pstm);
GC.KeepAlive(himl);
return(result);
}
public static BOOL Write(HandleRef himl, Ole32.IStream pstm)
{
BOOL result = Write(himl.Handle, pstm);
GC.KeepAlive(himl);
return(result);
}
public void DocumentComplete(object pDisp, ref object urlObject)
{
Debug.Assert(urlObject is null || urlObject is string, "invalid url");
_haveNavigated = true;
if (_parent.documentStreamToSetOnLoad != null && (string)urlObject == "about:blank")
{
HtmlDocument htmlDocument = _parent.Document;
if (htmlDocument != null)
{
Ole32.IPersistStreamInit psi = htmlDocument.DomDocument as Ole32.IPersistStreamInit;
Debug.Assert(psi != null, "The Document does not implement IPersistStreamInit");
Ole32.IStream iStream = (Ole32.IStream) new Ole32.GPStream(
_parent.documentStreamToSetOnLoad);
psi.Load(iStream);
htmlDocument.Encoding = "unicode";
}
_parent.documentStreamToSetOnLoad = null;
}
else
{
string urlString = urlObject is null ? string.Empty : urlObject.ToString();
WebBrowserDocumentCompletedEventArgs e = new WebBrowserDocumentCompletedEventArgs(
new Uri(urlString));
_parent.OnDocumentCompleted(e);
}
}
public NativeImageList(Ole32.IStream pstm)
{
IntPtr himl;
lock (s_syncLock)
{
himl = ComCtl32.ImageList.Read(pstm);
Init(himl);
}
}
private unsafe object GetDataFromOleIStream(string format)
{
FORMATETC formatetc = new FORMATETC();
STGMEDIUM medium = new STGMEDIUM();
formatetc.cfFormat = unchecked ((short)(ushort)(DataFormats.GetFormat(format).Id));
formatetc.dwAspect = DVASPECT.DVASPECT_CONTENT;
formatetc.lindex = -1;
formatetc.tymed = TYMED.TYMED_ISTREAM;
medium.tymed = TYMED.TYMED_ISTREAM;
// Limit the # of exceptions we may throw below.
if ((int)HRESULT.S_OK != QueryGetDataUnsafe(ref formatetc))
{
return(null);
}
try
{
innerData.GetData(ref formatetc, out medium);
}
catch
{
return(null);
}
if (medium.unionmember != IntPtr.Zero)
{
Ole32.IStream pStream = (Ole32.IStream)Marshal.GetObjectForIUnknown(medium.unionmember);
Marshal.Release(medium.unionmember);
pStream.Stat(out Ole32.STATSTG sstg, Ole32.STATFLAG.STATFLAG_DEFAULT);
IntPtr hglobal = Kernel32.GlobalAlloc(
Kernel32.GMEM.MOVEABLE | Kernel32.GMEM.DDESHARE | Kernel32.GMEM.ZEROINIT,
(uint)sstg.cbSize);
IntPtr ptr = Kernel32.GlobalLock(hglobal);
pStream.Read((byte *)ptr, (uint)sstg.cbSize, null);
Kernel32.GlobalUnlock(hglobal);
return(GetDataFromHGLOBAL(format, hglobal));
}
return(null);
}
public void DocumentComplete(object pDisp, ref object urlObject)
{
Debug.Assert(urlObject is null || urlObject is string, "invalid url");
_haveNavigated = true;
if (_parent.documentStreamToSetOnLoad is not null && (string)urlObject == "about:blank")
{
HtmlDocument htmlDocument = _parent.Document;
if (htmlDocument is not null)
{
Ole32.IPersistStreamInit psi = htmlDocument.DomDocument as Ole32.IPersistStreamInit;
Debug.Assert(psi is not null, "The Document does not implement IPersistStreamInit");
Ole32.IStream iStream = (Ole32.IStream) new Ole32.GPStream(
_parent.documentStreamToSetOnLoad);
psi.Load(iStream);
htmlDocument.Encoding = "unicode";
}
_parent.documentStreamToSetOnLoad = null;
}
protected override void Dispose(bool disposing)
{
try
{
if (disposing && comStream is not null)
{
try
{
comStream.Commit(Ole32.STGC.DEFAULT);
}
catch (Exception)
{
}
}
// Can't release a COM stream from the finalizer thread.
comStream = null;
}
finally
{
base.Dispose(disposing);
}
}
public DataStreamFromComStream(Ole32.IStream comStream) : base()
{
this.comStream = comStream;
}
public static extern HRESULT WriteEx(IntPtr himl, ILP dwFlags, Ole32.IStream pstm);
private unsafe object GetDataFromOleIStream(string format)
{
FORMATETC formatetc = new FORMATETC();
STGMEDIUM medium = new STGMEDIUM();
formatetc.cfFormat = unchecked ((short)(ushort)(DataFormats.GetFormat(format).Id));
formatetc.dwAspect = DVASPECT.DVASPECT_CONTENT;
formatetc.lindex = -1;
formatetc.tymed = TYMED.TYMED_ISTREAM;
// Limit the # of exceptions we may throw below.
if ((int)HRESULT.S_OK != QueryGetDataUnsafe(ref formatetc))
{
return(null);
}
try
{
innerData.GetData(ref formatetc, out medium);
}
catch
{
return(null);
}
Ole32.IStream pStream = null;
IntPtr hglobal = IntPtr.Zero;
try
{
if (medium.tymed == TYMED.TYMED_ISTREAM && medium.unionmember != IntPtr.Zero)
{
pStream = (Ole32.IStream)Marshal.GetObjectForIUnknown(medium.unionmember);
pStream.Stat(out Ole32.STATSTG sstg, Ole32.STATFLAG.DEFAULT);
hglobal = Kernel32.GlobalAlloc(
Kernel32.GMEM.MOVEABLE | Kernel32.GMEM.DDESHARE | Kernel32.GMEM.ZEROINIT,
(uint)sstg.cbSize);
// not throwing here because the other out of memory condition on GlobalAlloc
// happens inside innerData.GetData and gets turned into a null return value
if (hglobal == IntPtr.Zero)
{
return(null);
}
IntPtr ptr = Kernel32.GlobalLock(hglobal);
pStream.Read((byte *)ptr, (uint)sstg.cbSize, null);
Kernel32.GlobalUnlock(hglobal);
return(GetDataFromHGLOBAL(format, hglobal));
}
return(null);
}
finally
{
if (hglobal != IntPtr.Zero)
{
Kernel32.GlobalFree(hglobal);
}
if (pStream != null)
{
Marshal.ReleaseComObject(pStream);
}
Ole32.ReleaseStgMedium(ref medium);
}
}
public static extern BOOL Write(IntPtr himl, Ole32.IStream pstm);
public static extern IntPtr Read(Ole32.IStream pstm);
